Electric lamp socket



Nov. 14, 1933. Q G. H, ELWELL ELECTRIC LAMP SOCKET Filed Aug. 17, 1927 Patented Nov. 14, A1933 UNITED. vSTATES I PATlazN'ry oFFcE GeorgeA Henry Elwell, New Havem, Conn., as

' signor to The Greist Manufacturing-Company,

' a corporation o ApplicationfAugust 1v,'192'1.-seria1 No. 213,671 4c1aims. (012173-355) The invention relates to improvements in electric lamp sockets and especially in that type of sockets employing aV one-piece shell with an integral or permanently manufacture of a two-p usual cap and shell, it is c assembled cap. In the art socket, comprising the ustomary Vtok form-up the shell from flatstock and, asthat type of a shell rhas a forwardly facing lamp receiving end of a ,reducedV diameter, th

olf to provide an orice at reduced `end duringthe forming-'up process andbefore complecap is afterwards cut atthe previously capped end for the reception of thelamp and, for the end having the greater is provided which requires diameter, a separable cap *aV nely calculated means for the uniting of the cap and shell against of equal diameterr th axial and rotary movements.`

The manufacture of sockets by a` process producing a shell with an integral cap -Which -must be discarded andy then requiring the making separable connection to th sive means vvithl provided-is a-thing to be of another cap for a e shell by an expenwhich both `cap and shell. are

avoided in seeking a form of socket casing of minimum cost. The development of the art discloses previous attempts to producey a unitary ing, but the difficulty or one-piece socket casapparently lies in an endeavor to devise y,af suitable means fory locking the contents within. the one-,piece socket casing tion, and at the tical manner in tive means may switch element .through tr the cylindrical Wall of the ing. It is thereforethe ob to provide a socket casing roughout its axial formasame time to establish a pracwhich the manualsvvitch operabe separably connected with-the ansverse openings in` socket casing and lin' ject Aof this invention:

of rthe one-piece type to reduce the manufacturing cost of lamp sockets to a minimum; to eiectual means for locking usual socketcontents; and and `adequate means for manual operative means within the casing.

provide a convenient and within the casing the toprovide a practical connecting separable to the l switch element n with these and other objects .in view,`as'wi11 more fully hereinafter appear, the invention consists in certain features of novel construction and arrangement of parts 'trated in the accompanying e y out wherein patentable -noveltyis claimedrfor of the device, it being undercertain featuresY stood that within the scope of hereinafter described, illusdrawing and pointed what hereinafter thus is claimed various changes in form, proportion, size, .and can bemade without depa yminor details of the construction,

rting from theV spirit ,Y

' ment of theinvention,

the accompanying drawing (one sheet) in which GQ l f Connecticut ormodifying any of vention. Y v v The following is the description of an embodireference beinghad to insulation body portion; and theFigure Liis a,

detail view of an insulation sleeve portion.

Referring'rnore particularly to thedravvingin 7.0 which similar parts are similarly numbered, the socket casing 1 is preferablyillustratedjas a'onepiece construction as involving the minimum manufacturing cost although the casing might be made of. two or more pieces permanently assembled so'far as the applicability thereto of thel novel features hereinafter disclosed may be f concerned. In addition to the usual nipple aperture 2 in the capped end of the casing, andthe lamp-receiving opening?, at its forwardly facing end, the'cylindrical wall of the casing is provided with such necessary transversey opening, as at 4, as the radial insertion from the exterior and support `of, the switch operative means shall require.` LThe casingis furtherprovided with a to Vbe later explained. The insulation lining 9 is made in the customary cylindrical form to lie 'more or less snugly within the interior ofthe casingand to bear against the annular shoulder 7, the rearwardly extendinglugs 10 provided by the lining engaging Within the recesses' to` maintain a certain relative rotary position of both lining and body Within the socket casing.v The thickness of the wall-of the vlining at its-free end is reduced to exteriorly provide the annular shoulderll also forwardlyfacing, the purpose of which willbe later explained." rlfhe body of insulation carries 'thescrew-shell'and center con-f tacts 12 and 13, respectively, and alsoa reciprocating switch element not specifically illustrated 110 Y the advantages of the in-Y switch element, a sufcient enlargement of the. cavity extremities, as at 18, Ymustvbe v providedfor the radial insertion of the. push`V elements '19 when the parts in the progress of assembly are in the position illustrated by Figure 1. l lThe in-Y sulation lining is provided with the transverse opening 20 to register with .the enlargement 18. Each of the push elements is made of the customary insulation material and is provided rigidly mounted at its inner end with a metal clasp 21 with an extremity of slight resiliency provided with a bur 22 facing the inner end ofthe push element. A sheet metall locking collar 23, adapted to be inserted into thev forward end of thesocliet between the socket sing and the insulation lining, is provided with a rolled or Vformed-in screw-threadr24 adapted to"mesh with the internal presentation of the casing screw-thread 5, the locking collar being provided with an inner annular edge 25 adapted tov bear against the annular shoulder 1l of the insulation lining. The locking collar is also provided with anv outer rolled edge 26 extending forwardly beyond the j socket 'casing and which may be ltnurled to provide a roughened surface for manual rotation.

Inv assembling the parts of the electric lamp socket they are placed in the relative order'and position illustrated by Figure 1, and then `further inserted within the socket casing and the locking collar rotated until the parts of insulation are sufciently held in place thereby. While the insulation parts are being finally positioned the push elements are held in the position illustrated 5;! by Figure 1 in readiness to engage their clasps 4 2l over and about the extremities 15 of the switch element, the burs 22 snapping into their respective perforations 16, the engagement between bur and perforation co-operating with the clasp connection in maintainingr the correctposition of the push element while locked against withdrawal by means of thelocking collarV holding the insulation parts against axial movement.

No attempt is herein made to illustrate or describe the electric switch element in specic form or the location of the binding posts and wire connections as none has. any direct relative importance to the matter of disclosure of the novel v features herein set forth.

j against the body shoulder;

What I claim isre 1. An electric lamp socket comprising, in part, a casing having through its opposite wall portions atransverse opening; a body of insulation having a forwardly facing shoulder and carrying a reciprocating switch element having rearwardly directedv extremities; an insulation lining having throughits opposite wall portions a transverse opening and also having a forwardly facing shoulder, the rear end ofthe liningl bearing lockingl means provided by the forward end of the casing andadapted to bear rearwardly against the lining shoulder; and manual switch operative means comprising push elements having at their inner ends for-A j wardly facing open slots, each adapted to'receive one of the rearwardly directed extremities of the ing a reciprocating switch element having rearwardly directed extremities; an insulation lining having in its opposite wall portions a transverse opening therethrough; a locking means provided by the casing and insulation parts to lock the parts within the casing against forward axial movementj andmanual switch operativeV means comprising push elements having at their inner ends forwardly facing open slots, each adapted to receive one of the rearwardly directed extremities of the switch element as the push elements are radially inserted within the transverse openings and held in the path of the rearwardly borne body of insulation upon the assembly of the insulation parts within the casing, the manual means being maintained in locked relation to the switch element by the means locking the insulation parts within the casing Yagainst relative axial movement. Y I f 3. An electric lamp socket comprising, in part, acasing having in its opposite wallportions a transverse opening therethrough and a screwthread rolled in the metal around its forward end; a body of insulation having a forwardlyffacing annular shoulder withspaced recesses in the face thereof, the body carrying a reciprocating switch element having rearwardly directed extremities, each having a perforation; a cylindrical insulation lining having in its opposite wall portions a transverse opening therethrough and also having a forwardly facing annular shoulder and rearwardly extending spaced lugs to engage within the recesses as the lining bears against the body shoulder; manual switch operative means ccmprising Ypush elements provided at their inner end s with clasps, each having a resilient extremity provided with a bur, each 'clasp being adapted to receive one of the switch extremities as the push elements are radially inserted within the transverse openings and held lying in the path of the rearwardly borne switch extremities for clasping engagement therewith upon the assembly of the insulation within the casing, the bur of each clasp snapping into the perforation of its respective switch extremity; and a locking collar having an external screw-thread for engagement with the casing screw-thread, a rearwardly extending annular edge ofthe collar engaging the lining shoulder and anannular portion of the collar extending forwardly beyond thev casing to provide means for the manual rotation of the collar to lock the insulation parts within the casing against axial forward movement and thereby maintain the push elements in locked relation with the able through the open end of the casing and harving a peripherally reduced portion providing the body with a forwardly facing annular shoulder; a recess in the face of the annular shoulder; a transverse cavity extending through the reduced inner ends with clasps, each having a resilient ex'- ltremity provided with-a bur, each clasp being adapted to receive one of the switch extremities as the push elements, radially inserted within the transverse openings, are held in the path of the rearwardly -borne switch extremities for clasping engagement therewithupon the assembly of the body and lining of insulation within the casing, the bur of each clasp snapping into the perforation of its respective switch extremity; and locking means provided by the open endl of the casing and engageable with the lining shoulder,

GEORGE HENRY ELWELL. c 

